JP6471709B2 - Transmission belt - Google Patents

Description

  The present invention relates to a transmission belt formed by arranging a large number of plate-like elements facing each other in an annular shape and binding these elements in an annular shape by a metal ring, and particularly relates to the structure of the elements. .

  Patent Document 1 describes an example of this type of transmission belt. The element in the transmission belt described in Patent Document 1 has a saddle surface on which a ring is placed (wound), and a slit portion into which a smaller number of rings than the rings on the saddle surface are inserted. The saddle surfaces are formed on both the left and right sides of the so-called main body portion of the element with the central neck portion sandwiched therebetween. Moreover, the slit part is formed in the shape cut | disconnected in parallel with the said saddle surface from the right-and-left both sides of a main-body part. Therefore, the slit part is provided at a position close to the saddle surface at the rocking edge which becomes the rotation center where each element opens like a fan when entering the belt groove of the pulley in contact with each other. The friction between the ring and the slit portion is less than the friction between the saddle surface and the ring.

Japanese Patent No. 5234193

  In the element described in Patent Document 1, since the slit portion is formed in parallel to the saddle surface and on the inner peripheral side of the ring from the saddle surface, the main body portion is divided by the slit portion. The saddle surface is preferably formed at a position close to the rocking edge in order to reduce friction with the ring when the element rotates around the rocking edge, and similarly, the slit portion is located at the same position as the rocking edge. Alternatively, it is preferably formed at close positions. Therefore, the distance between the saddle surface and the slit portion is narrow, and as a result, the portion between the saddle surface and the slit portion, that is, the portion that partitions the slit portion from the saddle surface (hereinafter referred to as the partition portion) is thin. Become. And the end surface of the partition part becomes a part of flank surface which a main-body part contacts with a pulley and transmits torque.

  As described above, the partition portion not only separates the slit portion and the saddle surface, but also has a function of transmitting torque by the end surface contacting the pulley. For this reason, when an irregular situation such as the tilting of the element occurs, only the end face of the partition portion comes into contact with the pulley, and torque is transmitted between the element and the pulley by the partition portion. In such a case, a large bending load directed in the longitudinal direction of the ring acts on the thin section. Further, if the binding force of the element by the ring on the saddle surface is applied to the partition part and there is a gap inside the slit part, the binding force by the ring acts as a large bending load on the partition part. Since the partition portion is formed thin as described above, when a bending load is applied in the longitudinal direction of the ring and the radial direction of the ring, the bending stress at the end portion on the neck side of the partition portion increases, As a result, the durability of the transmission belt may be impaired.

  This invention was made paying attention to said technical subject, Comprising: It aims at supplementing the strength fall of the element accompanying providing a slit part, and suppressing the fall of the durability of a transmission belt. is there.

  In order to achieve the above-mentioned object, according to the present invention, a ring is formed on the element for bundling a large number of elements that are arranged in an annular shape with a uniform posture and whose flank faces are in contact with the pulley at both ends in the width direction. A locking edge, which is placed on the saddle surface and contacts the adjacent elements and becomes the rotation center of the element, is formed at a position farther to the inner peripheral side than the saddle surface of the element, and is arranged in an annular shape The at least one slit portion that accommodates the sub-ring that binds the plurality of elements formed is from the end in the width direction of the element to the center in the radial direction of the ring and closer to the inner diameter side than the saddle surface. A partition portion formed to have a predetermined length and a portion between the saddle surface and the slit portion extending from the central portion of the element to the end portion In the transmission belt, the distal end portion of the partition portion is retreated to the center side in the width direction of the element from the extension line of the flank surface, and the width of the sub-ring is from the center portion of the partition portion. A direction in which the frictional force of the ring acts on the partition portion is closed to the tip portion of the partition portion and a portion of the slit portion facing the tip portion, which is shorter than the length to the tip portion, and the slit portion is closed. The engaging part which has the surface which opposes with a direction is formed.

  According to this invention, since the tip end portion of the partition portion generated by forming the slit portion is retracted from the extension line of the flank surface, the tip end portion of the partition portion is in contact with the pulley and receives a bending load. Is avoided. The section has the same structure as a so-called cantilever whose tip is a free end. The ring on the saddle surface causes a frictional force in the direction opposite to the traveling direction of the element, and the ring A bending load (bending load in the direction in which the slit portion closes) based on the tension for binding the elements is received. When the length of the partition part is longer than the width of the sub-ring, when the tip part of the partition part bends in the direction in which the slit part closes, the surfaces of the engagement part come into contact with each other. Since the surfaces face each other in the direction in which the frictional force acts and the direction in which the slit portion closes, when the surfaces facing each other come into contact with each other, the partition portion bends further in the direction in which the slit portion closes, Further, it is possible to prevent further bending in the longitudinal direction of the ring. That is, since excessive deformation of the partition portion is prevented or suppressed, it is possible to prevent the durability of the element and the transmission belt composed of the element from decreasing, or improve the durability.

It is a front view which shows an example of the element in the power transmission belt which concerns on this invention. It is a typical perspective view which shows one of the engaging parts. It is the figure which looked at the engaging part from the front end side of the division part. It is a figure similar to FIG. 3 which shows the state which each inclined surface contact | abuts mutually. It is a figure similar to FIG. 3 which shows the other example of an engaging part typically. It is a schematic diagram of the continuously variable transmission which can use the transmission belt which concerns on this invention. It is a perspective view showing typically a part at the time of using the power transmission belt concerning this invention for a continuously variable transmission.

  Next, an embodiment of the present invention will be described. The transmission belt according to the embodiment of the present invention is used for, for example, a continuously variable transmission, and is sandwiched in a winding groove having a V-shaped cross section formed on the outer peripheral portion of the pulley, and between the pulley and the pulley. Torque is transmitted by the generated frictional force. An example thereof is schematically shown in FIG. 6, and a transmission belt (hereinafter referred to as a belt) 1 is wound around a driving pulley 3 and a driven pulley 4 that constitute a continuously variable transmission 2. These pulleys 3 and 4 are arranged so that a fixed sheave 6 and a movable sheave 7 each having a tapered surface 5 are opposed to each other, whereby a winding groove having a V-shaped cross section is provided between these sheaves 6 and 7. 8 is formed, and the movable sheave 7 is moved back and forth with respect to the fixed sheave 6 by actuators 9 and 10 such as hydraulic cylinders, so that the width of the winding groove 8 is changed.

  As shown in FIG. 7, the belt 1 according to the embodiment of the present invention is formed by annularly binding a large number of elements 11 with a ring 12 so that the belt 1 as a whole has an annular shape and both side surfaces are V-shaped or tapered. Configured. The elements 11 constituting the belt 1 shown in FIG. 7 are metal plate pieces having the same shape, and are arranged in an annular shape with the same posture. Therefore, there is always a place where the elements 11 are arranged in a fan-shaped (radial) so-called open state with the center of curvature of the belt 1 as the center without being arranged in parallel.

  In order to maintain the vertical and horizontal relative positions of the elements 11 in the aligned state, the convex portion 13 and the hole portion 14 into which the convex portion 13 is loosely fitted are provided at one place on both the front and back surfaces of the element 11. Is formed. Specifically, the convex portion 13 is formed so as to protrude from the back surface or the front surface when the hole portion 14 is formed by pressing one surface or back surface of the element 11 in the thickness direction to form a hole. ing.

  In addition, a locking edge 15 is formed on the element 11 in order to allow the elements 11 to be arranged in a fan shape while being in contact with each other. The locking edge 15 is a boundary line or boundary region where the thickness of the element 11 changes, and is formed so as to extend in the width direction substantially at the center in the radial direction of the element 11 (the radial direction of the annular shape of the array). Has been. That is, in the state where the belt 1 is wound around the pulleys 3 and 4, the peripheral length on the outer diameter side (the outer peripheral side as the belt 1) is increased in the radial direction of the element 11. On the contrary, since the circumference of the inner diameter side (inner circumference side as the belt 1) in the radial direction of the elements 11 is shortened, the distance between the elements 11 is narrowed. Therefore, the inner diameter side portion of the element 11 is configured to be thinner on the inner diameter end side. Thus, the rocking edge 15 is where the plate thickness changes between the inner diameter side and the outer diameter side in the radial direction of the element 11. Accordingly, each element 11 rotates in the plate thickness direction around the rocking edge 15, that is, pitching occurs and opens in a fan shape (radially) as described above. The locking edge 15 may be formed on either one of the front and back surfaces. Further, the position of the locking edge 15 is not limited to the above example, and may be configured to a position of a predetermined dimension from a predetermined reference position on each element 11. As the reference position, for example, the position of the rocking edge 15 may be determined with the flank surface that transmits torque between the pulleys 3 and 4 and the convex portion 13 and the hole portion 14 as the reference position.

  The left and right side surfaces in the width direction of each element 11, that is, the flank surface 16, as shown in FIG. 1, is a surface that transmits torque by contacting the inner surface (taper surface) 5 of the winding groove 8 in the pulley. The pulley is parallel to the taper surface 5 of the winding groove 8 in the pulley.

  Further, as shown in FIG. 1, the element 11 is formed with a saddle surface 17 on which a ring 12a having a laminated structure is placed, and the width of the saddle surface 17 is substantially equal to the width of the ring 12a. The ring 12a is formed by laminating thin metal bands, and is arranged on the saddle surface 17 so as to bind the elements 11 together. FIG. 1 shows an example in which the ring 12 a is arranged on the saddle surface 17 with the neck portion 18 of the element 11 interposed therebetween. Also in this belt 1, the ring 12 a is placed on the saddle surface 17, and the elements 11 are bundled so that the elements 11 maintain an annular arrangement state, so that the elements 11 do not separate outward in the radial direction. Act on. In addition to this, the ring 12 a also performs an action of pulling out the element 11 from the winding groove 8 when the element 11 is sent out from the winding groove 8 of the pulleys 3 and 4. Therefore, in order to prevent the ring 12a from coming out of the element 11 in the radial direction, a top portion 19 is provided to hold the ring 12a between the saddle surface 17 and the ring 12a.

  In each element 11, a slit portion 20 (or a second saddle surface) is formed on the inner diameter side of the saddle surface 17 in the radial direction of the belt 1. The slit portion 20 is provided in parallel with the saddle surface 17. The slit portion 20 is formed at a position as close as possible to the locking edge 15 described above. More specifically, since the plate thickness on the outer diameter side is thicker than the locking edge 15 in the radial direction of the element 11 and the inner diameter side is thinner, the position where the locking edge 15 is extended in both the left and right directions in the width direction of the element 11 is. The slit portion 20 is formed. Furthermore, the slit portions 20 are formed on both the left and right sides of the central portion of the element 11 in the width direction, and have a length that extends from the flank surface 16 to the lower side of the neck portion 18. One slit or a smaller number of sub-rings 12b than the ring 12a is accommodated in the slit portion 20, and the sub-ring 12b binds the elements 11 arranged in a ring shape.

  A thin portion formed between the saddle surface 17 by forming the slit portion 20 divides the saddle surface 17 on which the ring 12a is placed and the slit portion 20 forming the second saddle surface. 21. The length of the partition portion 21 measured in the width direction of the element 11 is shorter than the width of the winding groove 8, so that the tip portion 21 a of the partition portion 21 is on the inner side of the extension line of the flank surface 16 (the center of the element 11). Part of the taper surface 5 so as not to contact the tapered surface 5. Since the partition portion 21 is configured in this way, the width of the saddle surface 17 also does not reach the tapered surface 5, and accordingly, the width of the ring 12 a is approximately equal to the width of the saddle surface 17. ing.

  The width of the sub-ring 12b is set smaller than the length of the partition portion 21 described above. Therefore, when the sub-ring 12b is positioned in the back part of the slit part 20 (the part closer to the center of the element 11), a gap is formed on the distal end side of the partition part 21 in the slit part 20 to form the slit part 21. The inner surfaces are opposite to each other. Engaging portions 22 are provided on the inner surfaces of the slit portions 21 that face each other with such a gap.

  An example of the engaging portion 22 is shown in FIGS. The engagement portion 22 shown in these drawings includes an inclined surface 22a formed on a surface (hereinafter referred to as an upper surface) 20a facing the outside in the radial direction of the belt 1 among the inner surface forming the slit portion 20, and a slit. An inclined surface 22b formed on a surface facing the inner side in the radial direction of the belt 1, that is, a surface (hereinafter referred to as a lower surface) 20b on the slit portion 20 side of the partition portion 21 among inner surfaces forming the portion 20. ing. These inclined surfaces 22a and 22b are formed so as to recede in the radial direction of the belt 1 from the upper surface 20a and the lower surface 20b, and are substantially parallel to each other. More specifically, the inclined surface 22a formed on the upper surface 20a side is a surface inclined so as to face the front side in the traveling direction of the belt 1 (that is, the traveling direction of the element 11) and outward in the radial direction of the belt 1. Therefore, the inclined surface 22b on the lower surface 20b side is a surface inclined so as to face the rear side in the traveling direction of the belt 1 (that is, the traveling direction of the element 11) and inward in the radial direction of the belt 1. Yes. Since the belt 1 described here is a so-called push type belt that travels when the element 11 is pushed out of the pulley and the elements 11 press each other, the saddle surface 17 and the ring 12a mounted thereon are arranged. In between, a frictional force in the direction opposite to the traveling direction of the element 11 is generated. Therefore, it can be said that the inclined surfaces 22a and 22b face each other in the direction in which the frictional force acts. In addition, when the partition portion 21 is displaced in the direction in which the slit portion 20 is closed, the inclined surfaces 22a and 22b approach each other, and thus the inclined surfaces 22a and 22b are opposed to each other in the direction in which the slit portion 20 is closed. I can say that.

  Next, the operation of the element 11 in the belt 1 according to the embodiment of the present invention will be described. The element 11 sandwiched in the winding groove 8 in the driving pulley 3 is sequentially pushed out from the winding groove 8 by the rotation of the pulley 3 and presses the preceding element 11. When the element 11 thus advanced enters the winding groove 8 in the driven pulley 4, torque is transmitted to the driven pulley 4 as the element 11 advances. At that time, when a misalignment in the width direction occurs in the winding groove 8 between the driving pulley 3 and the driven pulley 4, the tip 21 a of the partition portion 21 is more than the flank surface 16 in the width direction of the element 11. Also, the front end portion 21a of the partition portion 21 is prevented or suppressed from contacting the pulleys 3 and 4 because they are retracted inward, that is, inward from the extended line of the flank surface 16. Therefore, it is suppressed that the bending stress accompanying torque transmission is applied to the base portion 23 where the partition portion 21 is connected to the neck portion 18. That is, the load applied to the neck portion 18 and the root portion 23 of the element can be suppressed, and accordingly, the durability of the partition portion 21 or the element 11 or the belt 1 can be improved.

  Further, since the ring 12 a is wound around the partition part 21, a bending load in the direction of closing the slit part 20 acts on the partition part 21. Further, a frictional force acting in a direction opposite to the traveling direction of the element 11 acts between the saddle surface 17 and the ring 12a. Due to these bending loads and frictional forces, the partition 21 is bent even slightly. The bending direction is a direction in which the lower surface 20 b of the partition portion 21 approaches the upper surface 20 a of the slit portion 20, and the tip portion 21 a of the partition portion 21 is retracted in a direction opposite to the traveling direction of the element 11. FIG. 4 schematically shows an example in which such deformation (bending) occurs in the partition portion 21, and the inclined surfaces 22 a and 22 b in the engagement portion 22 described above contact each other. As described above, the inclined surfaces 22a and 22b face the direction of receiving the load toward the inner peripheral side in the radial direction of the belt 1 due to the tension of the ring 12a and the frictional force generated by the ring 12a. Therefore, after the inclined surfaces 22a and 22b come into contact with each other, the bending load based on the tension or frictional force is received by the upper surface 20a via the partitioning portion 21, and the partitioning portion 21 can be bent further. Avoided or suppressed. Thus, the inclined surfaces 22a and 22b function to limit or suppress deformation of the partition portion 21, and correspond to “surfaces” provided in the “engagement portion” in the embodiment of the present invention.

  Next, another example of the configuration of the engaging portion 22 according to the present invention will be described. The inclined surfaces 22a and 22b described above have a shape that intersects the traveling direction of the element 11 (the direction in which the frictional force acts) and the radial direction of the belt 1 based on the tension of the ring 12a. It has a two-dimensional shape. In the embodiment of the present invention, two one-dimensional surfaces may be provided in the engaging portion 22 so that each surface receives a bending load caused by the frictional force and a bending load based on the tension. . An example of this is schematically shown in FIG. FIG. 5 is a view of the engaging portion 22 as seen from the distal end portion 21a side of the partition portion 21 as in FIGS. 3 and 4 described above, and the upper surface 20a and the lower surface 20b described above are notched in a rectangular shape. Two sides are formed.

  Of the lower surface 20b, the portion on the front end side of the partition portion 21 is cut out in a rectangular shape in the advancing direction of the element 11, and is a surface substantially parallel to the ring 12a or the lower surface 20b (hereinafter referred to as the lower surface 20b). 24a is formed on the parallel surface 24a. The surface is continuous to the front side in the traveling direction of the element 11 and is substantially perpendicular to the ring 12a or the lower surface 20b (hereinafter referred to as a vertical surface). ) 24b is formed.

  A portion of the upper surface 20a facing the front end portion of the partition portion 21 is cut out in a rectangular shape in the traveling direction of the element 11, and is substantially parallel to the ring 12a or the upper surface 20a. Thus, a surface (hereinafter referred to as a parallel surface) 25a facing the lower surface 20a is formed. The parallel surface 25a is continuous to the rear side in the advancing direction of the element 11 and is substantially perpendicular to the ring 12a or the upper surface 20a. A smooth surface (hereinafter, referred to as a vertical surface) 25b is formed.

  In addition, the notch width in the lower surface 20b and the upper surface 20a is larger than half of the thickness of the element 11. In other words, it is wider than the width of the remaining part after the notch. Accordingly, the vertical surfaces 24 b and 25 b are shifted by a predetermined dimension in the traveling direction of the element 11. The distance between the vertical surfaces 24 b and 25 b in the traveling direction of the element 11 corresponds to the bending allowance based on the frictional force of the partition portion 21. In addition, the distance between the parallel surface 24a and the upper surface 20a facing it and the distance between the parallel surface 24b and the lower surface 0b facing it are not necessarily the same, but are approximate dimensions. This corresponds to an allowable bending amount based on the tension of 21.

  According to the engagement portion 22 shown in FIG. 5, when the partition portion 21 is bent in the direction in which the slit portion 20 is closed by the tension of the ring 12a, the upper surface 20a is opposed to the parallel surfaces 24a and 25a. Or it contacts the lower surface 20b. Therefore, the partition part 21 is not bent further. In addition, when the bending load due to the frictional force described above is applied to the partition portion 21, each of the vertical surfaces 24 b and 25 b is bent by bending the partition portion 21 in the direction in which the friction force acts (the backward direction in the traveling direction of the element 11). Contact each other. Therefore, the partition part 21 is not bent further. As a result, even with the configuration shown in FIG. 5, the deformation (bending) of the partition portion 21 is suppressed, whereby the durability of the partition portion 21, the element 11, or the belt 1 can be improved. The parallel surfaces 24a and 25a and the vertical surfaces 24b and 25b correspond to “surfaces” provided in the “engagement portion” in the embodiment of the present invention.

  Here, the difference in operation between the engaging portion 22 shown in FIGS. 2 to 4 and the engaging portion 22 shown in FIG. 5 will be described. In the configuration shown in FIGS. 5 is received by the inclined surfaces 22a and 22b, the reaction force is dispersed in the configuration shown in FIG. 5 because the bending load due to the frictional force is received by the vertical surfaces 25a and 25b. There is nothing. Further, in the configuration shown in FIGS. 2 to 4, when the partition portion 21 is bent in the traveling direction of the element 11, the amount of bending of the partition portion 21 that allows the inclined surfaces 22 a and 22 b to contact each other (the element 11 (The amount of bending in the traveling direction) increases due to the fact that the surfaces in contact with each other are inclined. On the other hand, in the structure shown in FIG. 5, when the vertical surface 24b on the lower surface 20b side passes the vertical surface 25b on the upper surface 20a side in the advancing direction, the vertical surfaces 24b and 25b come into contact with each other. Therefore, a reaction force against bending cannot be generated. That is, in the configuration shown in FIG. 5, there are restrictions on the timing at which the partition portion 21 bends in the traveling direction and the timing at which the partition portion 21 bends in the radial direction of the belt 1.

  DESCRIPTION OF SYMBOLS 1 ... Transmission belt (belt) 5 ... Tapered surface 11 ... Element, 12, 12a ... Ring, 12b ... Sub-ring, 15 ... Rocking edge, 16 ... Frank surface, 17 ... Saddle surface, 20 ... Slit part, 20a ... Surface (upper surface), 20b ... surface (lower surface), 21 ... partitioning portion, 21a ... tip portion, 22 ... engagement portion, 22a, 22b ... inclined surface, 24a ... surface (parallel surface), 24b ... surface (vertical surface) 25a ... plane (parallel plane), 25b ... plane (vertical plane).

Claims (1)

A ring for bundling a number of flank elements that are arranged in an annular shape with the same posture and whose both ends in the width direction are in contact with the pulley is placed on the saddle surface formed on the element, and the adjacent elements are A locking edge that is the center of rotation of the element by contacting the element is formed at a position farther to the inner peripheral side than the saddle surface of the element, and accommodates a sub-ring that binds a plurality of the elements arranged in an annular shape At least one slit portion is formed in a predetermined length from an end portion in the width direction of the element to a central portion on the inner diameter side of the saddle surface in the radial direction of the ring, and the saddle surface and the slit In the transmission belt in which the part between the parts is a partition part extending from the central part of the element to the end part,
The tip of the partition part is retreated to the center side in the width direction of the element from the extension line of the flank surface,
The width of the sub-ring is shorter than the length from the central part to the tip part of the partition part,
The front end portion of the partition portion and the portion of the slit portion facing the front end portion have surfaces that face in the direction in which the frictional force of the ring acts on the partition portion and the direction in which the slit portion closes. A transmission belt characterized in that an engagement portion is formed.

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